diff --git a/static/dark.css b/static/dark.css
new file mode 100644
index 0000000..21c92fc
--- /dev/null
+++ b/static/dark.css
@@ -0,0 +1,18 @@
+@media (prefers-color-scheme: dark) {
+ html {
+ background-color: black;
+ color: white;
+ }
+
+ .box {
+ color: #eee; /* Make this darker to make the on-screen lighter. I don't know why. */
+ }
+
+ .button.is-primary {
+ background-color: #096;
+ }
+
+ input[type=range] {
+ accent-color: #096;
+ }
+}
\ No newline at end of file
diff --git a/static/index.html b/static/index.html
index 3691c00..a7d987f 100644
--- a/static/index.html
+++ b/static/index.html
@@ -24,6 +24,7 @@
+